impl: notify user when agent can't be contacted #249
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At a recent customer incident the Coder server could not ping the agent for a short brief of time because of intermittent network issues. The user had no idea they have network issues and was expecting the ssh sessions to work flawlessly.
This PR lays the groundwork for monitoring the connection by checking the status for workspace, agent and agent lifecycle and make an educated guess when the network runs into issues.